WO1994023321A1

WO1994023321A1 - Terminal of optical fiber, method of its manufacture, and structure for connecting the terminal and optical device

Info

Publication number: WO1994023321A1
Application number: PCT/JP1994/000536
Authority: WO
Inventors: Takashi Shigematsu; Hisaharu Yanagawa; Takeo Shimizu; Shiro Nakamura; Kazuya Fukasawa; Tomohiro Watanabe
Original assignee: The Furukawa Electric Co., Ltd.
Priority date: 1993-04-02
Filing date: 1994-03-31
Publication date: 1994-10-13
Also published as: DE69424979T2; EP0644442B1; EP0644442A4; CA2135777A1; CN1106616A; DE69424979D1; EP0644442A1; US5548675A; CA2135777C

Abstract

An optical fiber terminal (10) for optically connecting an optical fiber and an optical device comprises a ferrule (11) having an abutting end (11e) which faces an optical device (20) or abuts on it and a single fiber hole or a plurality of fiber holes which are arranged in parallel at given pitches and through which the ends of optical fibers are passed and fixed with adhesive. The ferrule is a molded product of synthetic resin. At least one connecting member (12) is provided on the abutting end (11e). The linear expansion coefficient of the connecting member (12) is smaller than that of the synthetic resin constituting the ferrule.

Description

Optical fiber terminal part, method of manufacturing the same, and connection structure between terminal part and optical device

The present invention relates to an optical fiber terminal unit, a method of manufacturing the same, and a connection structure between the terminal unit and an optical device. Background art

Conventionally, the optical connection between an optical device such as an optical waveguide component or an optical semiconductor device (LD array: LED array) and an optical device ^ c is conventionally defined by a plurality of optical devices. The optical devices are arranged such that the terminals are arranged at predetermined pitches and the optical device ends and the optical devices are abutted or opposed to each other. Then, alignment is performed by aligning the optical axis between the optical fiber 'and the optical device, and the two are bonded with an adhesive such as a thermosetting type or a light (ultraviolet) setting type. After facing each other at a predetermined distance, align the optical axis between the optical fiber and the optical device. Immediately after the alignment, the optical fiber is placed on the metal base. It is performed with welding fixed

As a first example of such connection between an optical fiber terminal and an optical device, for example, the connection between an optical fiber terminal and an optical waveguide is known. It is.

The optical fiber terminal section has a plurality of optical fibers in the sheath. It is equipped with tape-shaped pipes arranged at a fixed pitch and a pair of nozzles. The filter has a butted end face facing or butted with the waveguide component, and a plurality of fiber holes formed in parallel with a predetermined pitch. Then, one end of an optical fiber is inserted into each of the fiber holes and is fixed by bonding, and each optical fiber is exposed to the abutting end face. The above-mentioned plastic is the most inexpensive plastic molding using a mold and is a general manufacturing method.

In addition, the optical waveguide component has a waveguide substrate and a waveguide layer, or further has a cover adhered on the waveguide layer. One or more waveguides are formed, and each waveguide is exposed at the butted end faces on both sides. Here, the cover is formed by approximating the area and shape of the butt end face of the optical waveguide component to the butt end face of the optical fiber end part. This is to secure an effective area for bonding between the parts.

After the optical fiber terminal section abuts the optical waveguide component and the butt end face, aligns the optical fiber with the corresponding waveguide, and then bonds the optical fiber component to the optical waveguide component. It is done.

At this time, when the optical fiber terminal and the optical waveguide component are bonded to each other, especially in order to suppress the connection loss at the optical fiber terminal to be small, the optical fiber is particularly required. When the fiber is in the single mode, the optical fiber and the corresponding waveguide are aligned with a submicron order, and both are aligned while maintaining the alignment state. Short It must be fixed in time.

As such an adhesive means, a thermosetting adhesive such as an epoxy resin that cures at a high speed is used. The ends of the optical fiber and the optical waveguide component are abutted so that the optical path is not interrupted between each optical fiber and the corresponding waveguide. The optical fiber and the waveguide, which are exposed on the end face, are bonded together except for the waveguide.

Also, as a second example, connection between an optical fiber terminal portion having another structure and an optical waveguide component is known.

This optical fiber terminal portion includes a tape fiber, a V-groove substrate, and a holding cover, and abutted end faces are formed at both ends. In the tape fiber, a plurality of optical fibers are arranged at a predetermined pitch in the coating, and the coating is removed from the end to expose the end of each optical fiber. Then, the exposed end of each optical fiber is positioned in each V-groove formed on the V-groove substrate, and each optical fiber is covered by covering the holding groove. Fixed on V-groove substrate.

Here, the end face of each optical fiber is exposed to the butted end face, and the end face is polished together with the V-groove substrate and the holding cover. Optically transparent material such as steel is used.

The optical waveguide component is configured in the same manner as the optical waveguide component of the first example, and the can is an optically transparent material such as glass. Then, the end of the optical fiber and the optical waveguide component are abutted with each other and the end faces are joined to each other, and the alignment is performed between the corresponding optical fiber and the waveguide. After that, they are bonded with a light-curing adhesive while irradiating curing light (ultraviolet light).

At this time, since the V-groove substrate and the cover cover are optically transparent materials, the transmitted ultraviolet rays are harder than the high-speed curing thermosetting adhesive such as epoxy resin. Since the adhesive is cured in a shorter time, the optical fiber terminal and the optical waveguide component are quickly bonded at the butt end face.

Further, as a third example, a connection between the optical fiber terminal of the second example and an optical semiconductor is also known.

The optical semiconductor has a heat sink disposed between an LD array in which a plurality of laser diode elements are arranged in a line and a carrier. The carrier element is electrically connected to the carrier by a bonding wire, and the carrier is fixed to a metal mount base. You.

On the other hand, the optical fiber terminal is welded to the metal base via the sub-base, and each optical fiber of the tape fiber is connected to the corresponding laser diode. The base is welded to the mount base in alignment with the base element.

At the time, there were the following problems in the connection between the optical fiber terminal and the optical device.

First, in the connection between the optical fiber terminal and the optical waveguide component shown in the first example, the optical waveguide component is, for example, For re co down silica-based optical waveguide component is deposited on a quartz-based waveguide layer on a substrate, about 2 have contact to the linear expansion coefficient of about 2 0 ° C 4 X 1 0 -. Ru ⁶ Der. This is to be paired, the light off § Lee carbonochloridate terminal unit, plus switch Tsu linear expansion coefficient of the click that make up the full error rule is, For example - dioxide silicic element (S i 0 ₂₎ microparticles If the E port key sheet resin containing as a full I la chromatography TMG, about 2 0 ° to have you to C 5 X 1 0 - Ru ⁶ or on der.

For this reason, after connecting the optical fiber terminal and the optical waveguide component, the difference in the linear expansion coefficient between the two due to the temperature change over time in the use environment causes There has been a problem in that the alignment between the waveguides and the optical fiber is disturbed, which leads to a reduction in connection loss and the like, leading to a reduction in performance and loss of function.

In addition, the fin rail of the optical fiber terminal is manufactured by plastic molding using a mold, so that a plurality of fiber holes are used. If the coefficient of linear expansion in the array direction differs from the coefficient of linear expansion in the direction perpendicular to the array direction, warpage or other deformations may occur in the phenol layer. There was another problem that it was not possible to form fiber holes with high precision.

In addition, the optical fiber terminal has conventionally been combined with epoxy resin to add a filler to the resin to reduce the coefficient of linear expansion and improve strength and dimensional accuracy. And the use of optically opaque materials. For this reason, it has been impossible to connect a conventional optical fiber terminal to an optical waveguide component using a light-curing adhesive. On the other hand, the optical fiber terminals shown in the second and third examples are made of a V-groove substrate or a material for the holding boss, in addition to the above-mentioned glass, and silicon. It is also possible to use optically transparent materials such as plastics and ceramics.

However, glass, silicon, and ceramic are all hard and brittle, and the V-groove is difficult to grind and the abutment end face is poorly polished. However, there was a problem that the processing cost was required.

The optical fiber terminal is assembled by positioning each fine optical fiber in the V-groove, and fixing each optical fiber to the V-groove substrate with a holding knob. For this reason, workability in the assembling work was poor. Since the optical fiber is fixed with the presser cover, the optical fiber is pressed excessively by the presser cover.

When stress was applied to each of the optical fibers extending from the V-groove substrate, the optical fibers could be easily disconnected. In view of the above, an optical fiber terminal portion, which can be molded with high precision, and thus has excellent connectivity with an optical device, a method of manufacturing the same, and a terminal therefor. It is intended to provide a connection structure between a unit and an optical device.

Another object of the present invention is to provide an optical fiber terminal part which is easy to manufacture and inexpensive, and which is hard to break the optical fiber, a method of manufacturing the same, and a terminal part and an optical device. The purpose of this is to provide a connection structure. Disclosure of invention

To achieve the above object, according to the optical fiber terminal of the present invention, an abutting end face facing or abutting an optical device, and a single fiber are provided. It has a hole or a plurality of fiber holes formed in parallel at a predetermined pitch, and one end of an optical fiber is inserted into each of the fiber holes and bonded and fixed. The optical fiber is connected to an optical device, the optical fiber is connected to an optical device, and the optical fiber is formed of a synthetic resin molded product. Thus, at least one connecting member is provided on the end face side of the butt with the optical device.

With this configuration, the optical fiber terminal is easy to manufacture, and is connected to the optical device via the connecting member, thereby improving the connectivity. You.

Preferably, the connecting member has a linear expansion coefficient CM smaller than a linear expansion coefficient it _{FP of the} synthetic resin constituting the ferrule.

Accordingly, the optical fiber terminal portion suppresses the thermal expansion and shrinkage of the synthetic resin of which the connecting member constitutes the X rule when the ferrule is molded.

Preferably, the connection member is an optically transparent material, for example, glass, which is at least partially exposed on the outer periphery of the butt end face of the fuller. As a result, the optical fiber terminal is connected to the optical device in a short time using a light-curing adhesive because light transmits through the connecting member. You.

Preferably, the ferrule is a molded article made of a thermosetting, thermoplastic or photocurable synthetic resin.

Accordingly, the optical fiber terminal portion is molded at low cost using a metal mold with a plastic rule.

Also preferably, the synthetic resin constituting the ferrule contains silicon dioxide as a coupling agent and a filler.

This improves the adhesiveness between the optical fiber terminal and the glass connecting member in the optical fiber terminal.

Further, it is preferable that the synthetic resin constituting the above-mentioned cellulose has a refractive index close to the refractive index of the above-mentioned silicon dioxide. More specifically, a coloring component or a carbohydrate is preferred. Optically transparent material that does not contain copper.

As a result, when the optical fiber terminal section is connected to an optical device, the irradiation light is more easily transmitted, and the light-curing adhesive used is shorter. Hardens in time. In addition, the absorption of the illuminating light by the phosphor is reduced, so that the heat generated at the end of the optical fiber is also reduced, and the dimensional change due to the temperature rise is reduced. Can be suppressed.

Preferably, the connecting member has a coefficient of linear expansion a _CM The coefficient of linear expansion of the constituent materials of the optical device. . I was related _{to, I «C M - aon I} <5 X 10- 6 glass satisfies the relationship, and have Ru Oh causes Awa can correspond setting only metallic member and the collision in the position you of the light Device Lee be welded The coefficient of linear expansion _MC of the connection member is the coefficient of linear expansion α _の of the metal member. Seki was I a we- _non-M to. A metal that satisfies the relationship 5 x 10 " ⁶ .

As a result, the difference in the linear expansion coefficient between the optical fiber terminal and the optical device due to the temporal change in temperature is small, and the optical fiber terminal is exposed to the temperature change. The dimensional change is suppressed to a small extent, and a decrease in performance or loss of function such as a decrease in connection loss over time is suppressed.

Preferably, the connecting member has an opening surrounding the periphery of the butt end face of the ferrule, and the opening is bonded to the ferrule by an optical fiber. The number of fibers is Ν, and the array pitch of the optical fibers is Ρ, where the length a in the direction orthogonal to the array direction of the optical fibers is 0.2. ~ 1. Ό mm, length b in the array direction is set to satisfy the relationship of b = P x (N-1) + a.

As a result, in the optical fiber terminal portion, the area ratio of the connecting member occupying the entire butt end face is set to an appropriate value. '

Further, according to the method for manufacturing an optical fiber terminal portion of the present invention, a pair of template plates is disposed between the pair of template plates, and a plurality of optical fibers are inserted therethrough. A connecting member is arranged on at least one end of a core having a plurality of forming pins for forming a fiber hole to be formed. A synthetic resin is injected into a cavity formed between the set of template, the core, and the connecting member to form a plastic, and each of the plastics is formed. The optical fiber is inserted through the fiber holes and bonded to each other, thereby fixing one end of each of the optical fibers.

As a result, the optical fiber terminal is manufactured so that the optical fiber is not easily broken and the manufacturing is easy and inexpensive.

Further, according to the connection structure between the optical fiber terminal section and the optical device according to the present invention, the optical fiber terminal section is connected to the optical device so as to face or face-to-face. This is the configuration that was used.

At this time, preferably, the optical device is an optical waveguide component in which a plurality of waveguides having the same arrangement pitch as the plurality of optical fibers are formed. A connection structure in which the optical fiber terminal according to any one of claims 3 to 8 is bonded to the optical fiber terminal according to any one of claims 3 to 8 by an ultraviolet-curing adhesive at a connection member provided in the rule. And

With this, the optical fiber terminal and the optical waveguide component are connected in a short time.

Preferably, the optical device is an optical waveguide component comprising a metal tube formed with a plurality of waveguides having the same arrangement pitch as the plurality of optical fans and surrounding an outer periphery thereof. The connection structure is welded to the optical fiber terminal described in any one of claims 9 to 12 at the end face of the metal cylinder. More preferably, the optical device is an optical semiconductor in which a plurality of laser diode elements are arranged, and the optical device is provided on a first metal base and an optical fiber. The terminals are arranged on the second metal base so as to face each other and to be aligned between the respective optical fibers and the corresponding laser diode elements. A connection structure in which the first and second metal bases are welded to each other.

This provides a connection structure in which the optical waveguide component or the optical semiconductor and the optical fiber terminal are connected by welding.

Here, “optically transparent” as used herein means that the transmittance of visible light and ultraviolet light is at least 10% or more.

Further, various linear expansion coefficients used in the following description of the present specification have a value of about 20. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 illustrates a first embodiment of the present invention. FIG. 1 is a perspective view showing an optical fiber terminal part and a connection structure between the terminal part and an optical waveguide component. FIG. The front view of the connecting member installed on the end face of the filter in the fiber terminal section. Fig. 3 is used for the optical fiber terminal section in Fig. 1. Figure 4 is a perspective view of the nozzle, Figure 4 is a front view of the nozzle shown in Figure 3, Figure 5 is a cross-sectional view of the nozzle shown in Figure 3, and Figure 6 is a view of the nozzle shown in Figure 3. Fig. 7 is a perspective view of a molding die used for manufacturing the rule. FIG. 6 is a perspective view showing a state in which a tape fiber is inserted into a rule manufactured by the molding die shown in FIG. 6, and FIG. 8 is a diagram in which an adhesive is injected into the rule shown in FIG. FIG. 9 is a perspective view showing a state in which a tape fiber is fixed to form an optical fiber terminal, and FIG. 9 shows a connection structure in which the optical fiber terminal is bonded to an optical waveguide component. Fig. 10 is a cross-sectional view, Fig. 10 is a characteristic diagram showing the relationship between the vertical length a of the opening of the connecting member and the cracking rate (%) of the connecting member in the molded phenol rail, and Fig. 11 is the same. First, the characteristic diagram showing the relationship between the vertical length a of the opening of the connecting member and the HC characteristic fluctuation width (dB) in the heat cycle (HC) test, and FIG. 12 is the same. Fig. 13 is a characteristic diagram showing the relationship between the vertical length a of the opening of the connecting member and the pass rate (%) of the molding pin trouble. Irradiation of ultraviolet light required when bonding the molded ferrule and the optical waveguide component to each other with the ultraviolet curing adhesive, and the vertical length a of the opening of the connection member in the formed phenol layer. FIG. 14 to FIG. 19 are characteristic diagrams showing a relationship with time, FIG. 14 is a perspective view showing a modified example of the optical fiber terminal section, and FIG. 20 is a view for explaining a second embodiment of the present invention. FIG. 21 is a perspective view illustrating an optical fiber terminal portion and a connection between the terminal portion and the optical waveguide component. FIG. 21 is a perspective view illustrating a connection structure between the optical fiber terminal portion and the optical waveguide component. FIG. 22 is a perspective view showing an optical fiber terminal section and a connection structure between the terminal section and the optical semiconductor for explaining the third embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

First embodiment

Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 19.

As shown in FIG. 1, an optical fiber terminal portion (hereinafter, referred to as a “terminal portion”) 10 of the present embodiment has a connecting member 12 and a tape fiber connected to a fin rail 11. Since the fiber 13 is attached, the terminal portion 10 is bonded to the optical waveguide component 20 using an ultraviolet-curable adhesive.

Ferrule 11 is formed of an optically transparent synthetic resin having a small heat shrinkage. In the present embodiment, as such a synthetic resin, for example, 70% by weight or more of silicon dioxide particles are mixed as a filler, and the refractive index of the silicon dioxide is the refractive index of the silicon dioxide. substantially equal said in rather a linear expansion coefficient a _FP is 1 2 X 1 0 - had use of Oh Ru thermosetting ⁶ d poke sheet resin.

Here, the thermosetting synthetic resin, for example, the epoxy resin contains a force-upping agent for increasing the adhesive strength between the silicon dioxide particles. Accordingly, the later-described components. The adhesion between the glass member and the connection member 12 is also high.

As shown in FIGS. 3 and 5, the phenol rail 11 is a hollow member having a cavity 11 b formed at the rear of the main body 11 a and protrudes from the optical waveguide component 20 at the front. A protruding portion 11c to be fitted is protruded from the body, and an opening 11d communicating with the cavity 11b is formed at an upper portion. The protruding part 1 1 c has a front face that protrudes from the optical waveguide component 20. It is a mating end face 11e, and a concave groove 11f is formed in the periphery. A connection member 12 described later is provided around the concave groove 11f (see FIGS. 1 and 7). As shown in FIGS. 4 and 5, the protruding portion 11c has four fiber holes 11g that open to the butt end face lie and communicate with the cavity 11b. Has been formed. Further, as shown in FIGS. 5 and 7, the protruding portion 11c is provided with an optical fiber 13a, which will be described later, at a position adjacent to each fiber hole 11g. A fiber guide 11h is formed to guide the porcelain hole llg to improve penetration.

Here, the shapes of the protruding portion 11c and the concave groove 11f are determined by the shape of an opening 12a of the connecting member 12, which will be described later, and the concave groove lf is not necessarily required.

Connecting member 12 is optically transparent, Ri linear expansion coefficient of the CM 3. a 0 to 3.6 1 0 ⁶ pie-les-click scan glass or al, waveguides of the optical waveguide component 20 you later 22a. Linear expansion ratio a in the array direction. Uses something close to _D. The connection member 12 has an opening 12a surrounding the periphery of the butt end face lie, and is formed into a quadrangular frame shape that abuts with the optical waveguide component 20 together with the butt end face lie. ing.

The dimensions of the opening 12a affect the strength and formability of the connection member 12, the time of ultraviolet irradiation when connecting to the optical waveguide component 20, and the like, and the optical fiber shown in FIG. The length in the direction perpendicular to the array direction of the optical fiber (hereinafter referred to as the “vertical length”) a (mni) within the range of 0.2 ≤ a ≤ 1.0, and the optical fiber array direction Length (below Below, it is referred to as “horizontal length”) b (mm) is the number of fiber holes llg. Accordingly, the optical fiber 13 a of the tape fiber 13, which will be described later, is used. When the number is N and the array pitch of the optical fiber 13a is P (mm), the relationship is set as b = P x (N — l) + a.

Here, if the area of the front surface of the connecting member 12 with respect to the entire butted end face lie is small, and accordingly, the area ratio of the connecting member 12 is smaller than an appropriate value, the pitch is small. The connecting member 12 is cracked by the filling pressure of the synthetic resin when the seal 11 is molded, or the connecting member 12 is damaged due to a heat cycle or the like. For this reason, there arise problems such as a decrease in the reliability of the manufactured pen rails 11 and eventually of the terminal unit 10. In addition, when bonding is performed using a light-curing adhesive, it is difficult for the irradiation light to pass through to the center of the end face, and it takes time to bond the optical waveguide component 20.

On the other hand, if the area of the connecting member 12 occupying the entire butted end face lie is large and the area ratio is large compared to the appropriate JE value, high dimensional accuracy is required for manufacturing the connecting member 12. It becomes. — For this reason, the manufacturing cost of the ferrule 11 and, therefore, the terminal unit 10 is increased. In addition, when the pen rails 11 are formed, if the setting work for setting the connecting members 12 into the molding die is not carefully performed, the molded rails are not formed. 11 The fiber hole 11 g on the rail 11 approaches the connecting member 12 too much, causing troubles such as breakage or bending due to the contact of the molding pin. _{c Accordingly} , in the connection member 12, the dimensions of the opening 12a are set as described above. This rule 11 is manufactured by using a molding die described below.

FIG. 6 shows a molding die used for manufacturing the ferrule 11, which is disposed between the lower die plate 30, the upper die plate 40 and the both die plates 30, 40. It has a core 50.

The lower template 30 is moved up and down by a driving means (not shown), and the upper template 40 is opened or clamped to the upper template 40. As shown in the figure, the lower mold plate 30 is provided with convex portions 30a for positioning the upper mold plate 40 at four corners of a square ^, and a molding die 3 32 at the center. A concave portion 30b is formed in which is disposed. The lower mold plate 30 is provided with runners 30c, 30c from both sides toward the recess 30b.

The molding die 31 is a flat plate-shaped member disposed at one end of the concave portion 30b, and has a V-groove 31a on the upper surface for positioning a tip of a molding pin 50d, which will be described later, of the core 50. It has been done. On the other hand, the molding die 32 is a U-shaped member that is disposed substantially at the center of the concave portion 30 b in which the molding die 31 is disposed and supports a body 50 a of the core 50, which will be described later. When the mold plate 40 and the mold plate are clamped, a cavity (not shown) for forming the ferrule 11 is formed at the front portion thereof. The molding die 32 positions a later-described flange portion 50b of the core 50 disposed in the concave portion 30b.

As shown in FIG. 6, the upper template 40 is disposed between the convex portions 30a, 30a of the lower template 30 on both sides of the rectangular plate, and the upper template 40 is attached to the lower template 40. Flange to be positioned with respect to 30 40a, 40 a is provided on the body, and a concave portion 40 b in which the molds 41 and 42 are arranged is formed in the center. In FIG. 6, the upper mold plate 40 is shown with its upper and lower surfaces inverted for clarity of the configuration. In practice, the upper mold plate 40 is inverted as shown by the one-dot chain line. The lower mold plate 30 is opposed to the lower mold plate 30.

Here, the molding dies 41 and 42 are the same as the molding dies except that a V-groove for positioning a molding pin 50 d described later is not formed on the clamping surface 41 a of the molding dies 41. Since the configuration is the same as 31, 32, in the following description and drawings, the corresponding parts are denoted by the same reference numerals, and detailed description is omitted.

As shown in the figure, the core 50 has a flange 50b formed at the rear part of the main body 50a and a hollow lib of the vinyl rail 11 formed at the front part of the main body 50a. A core part 50c and four forming pins 50d for forming the fiber hole llg are protrudingly provided.

When manufacturing the pen rails 11, first, as shown in the figure, the forming dies 31 and 32 are formed in the concave portions 30 b of the lower die plate 30 and the concave portions 40 b of the upper die plate 40. The molds 41 and 42 are arranged respectively.

Next, as shown by a dashed line in the figure, the forming pin 50 d is inserted through the connecting member 12, and the connecting member 12 is inserted into the concave portion 30 b between the molds 31 and 32, and the flange portion is formed. 50 b is placed in the concave portion 30 b at the rear of the molding die 32, and the tip of each molding pin 50 d is positioned in the V groove 31 a, and the core 50 is placed on the lower mold plate 30.

Next, the lower mold plate 30 is raised by the driving means (not shown), and the corresponding flat of the upper mold plate 40 is formed between the convex portions 30a, 30a. Place flange 40a and tighten the mold.

As a result, the connecting member 12 and the core 50 are disposed between the concave groove 30 b of the lower template 30 and the concave portion 40 b of the upper template 40, and are provided on the inner portion of the connecting member 12. A predetermined gap for forming the protrusion 11c of the ferrule 11 is formed by inserting the base end of each molding pin 50d. Further, the main body 11a of the ferrule 11 is formed between the lower mold plate 30 and the upper mold plate 40 between the molding dies 32 and 42 located at the rear portion of the connection member 12 not shown. The cavities are formed.

After the force is applied, the optically transparent epoxy resin mixed with silicon dioxide particles having a small heat shrinkage ratio using the runners 30c, 30c of the lower template 30. Is injected into the above-mentioned cavity, and the rule 11 is formed by forming a transformer.

After the injected epoxy resin is cured by heating, the lower mold plate 30 is lowered to open the mold, and the molded ferrule 11 is taken out.

Thereafter, the core 50 is pulled out from the nozzle 11 and the production of the valve 11 is completed.

The thus-produced plastic rule 11 is processed as a terminal portion 10 by inserting a tape fiber from the rear side.

In short, a tape fiber is a ribbon-like optical fiber in which a plurality of optical fibers are arranged in parallel at a predetermined pitch, and these optical fibers are coated. Fiber bundle. In the terminal section 10 of the present embodiment, the terminal of the tape fiber is processed to remove the coating by a predetermined length, and the exposed individual optical fibers are filtered.ヱ Insert into the cavity 11 b from the rear side of the nozzle 11.

Then, as shown in FIG. 7, the phenol rail 11 is inserted into the corresponding fiber hole 11 g of each optical fiber of the tape fiber 13, * 13a. As shown in Fig. 8, the adhesive A is injected into the cavity 11b from the opening 1Id, and the tape fin 13 is fixed to the main body 11a together with the optical fin 13a. It is.

In this case, in the tape fiber 13, the optical fiber 13a may protrude from the protruding portion 11c, but the protruding optical fiber 13a has a butt end face li. After the cutting process is performed so that it is substantially flush with e, the end surface is polished by tubing or the like together with the butt end surface lie. Through such a process, the ferrule 11 is processed into the terminal portion 10.

At this time, in the manufactured end portion 10, the linear expansion coefficient a _CM of the connecting member 12 is set to be smaller than the linear expansion coefficient α of the rule 11. For this reason, at the time of the high temperature accompanying the molding of the ferrule 11, the connecting member 12 suppresses the expansion in the width direction and the vertical direction of the protruding portion 11c, and suppresses the shrinkage at the time of cooling after the molding. Accordingly, in the rail 11, since the expansion and contraction of the protruding portion 11 c is suppressed by the surrounding member 12, the fiber hole 11 g opened in the butted end face 11 e is high. Formed with precision. Further, the plurality of optical fibers 13a exposed by removing the coating are protected by being buried in the adhesive A in the cavities 11b of the ferrule 11 (see FIG. 9). Even if stress is applied via the inverter 13, there is no disconnection.

The terminal section 10 manufactured in this manner is coated with an ultraviolet-curing adhesive, for example, an epoxy-based or acrylic-based adhesive, between the optical waveguide component 20 and the terminal section 10. It can be adhered in a short time by irradiating ultraviolet rays.

In the optical waveguide component 20, a waveguide layer 22 made of quartz having a thickness of 10 m is formed on a silicon substrate 21 having a thickness of 1 mm by, for example, a flame deposition method. is, the upper pi les click Sugara scan or et ing cover 23 that have a near-have linear expansion coefficient in the sheet re co down is placed over the linear expansion coefficient a _{0 D} about 2. 4 X 1 0 _ ⁶ parts, that are Tsu Do the longitudinal ends butting end face.

Here, in the waveguide layer 22, four waveguides 22a are formed in the longitudinal direction in parallel with the plurality of optical fibers 13a at the same pitch. In addition, the canopy 23 is designed to make the area and shape of the butted end face of the optical waveguide component 20 approximate to the end face of the terminal part 10, thereby providing an adhesive between the terminal part 10 It secures an effective area.

In addition, the optical waveguide component 20 may be one having no power bar 23 only by forming the waveguide layer 22 on the silicon substrate 21, and The waveguide 22a to be formed may be singular. In this bonding, the terminal section 10 and the optical waveguide component 20 are bonded by aligning the corresponding optical fiber 13a and the waveguide 22a with a sub-mixer. You.

In the connection structure between the terminal portion 10 and the optical waveguide component 20, the irradiated ultraviolet light passes through the portions of the rule 11 and the connection member 12, so that the adhesive is cured in a short time.

Accordingly, in the connection structure between the terminal section 10 and the optical waveguide component 20, the corresponding optical fin 13a and the waveguide 22a are aligned in the submicron order. In this state, as shown in FIG. 9, the portion of the connecting member 12 is more securely bonded by the ultraviolet curing adhesive _Auv .

However also, our Itewa the connection structure of the terminal portion 10 and the optical waveguide part 20, the connecting member 12 is a linear expansion coefficient _CM is at 3. 0 ~_3. 6 x 1 0 _ 6, the optical waveguide component 20 linear expansion The ratio a on is about 2.4 X 10 " ⁶ , and I a _CM — satisfies the relationship of _D | <5 x iO — ⁶ .

For this reason, in the connection structure described above, the difference in the linear expansion coefficient between the terminal portion 10 and the optical waveguide component 20 due to the temporal change in temperature is small, and thus the connection structure is not affected by the temperature change. The dimensional change is suppressed to a small extent, and the alignment state between each optical fin 13a and the waveguide 22a is not disturbed. Therefore, by adopting the above-described connection structure, it is possible to prevent performance deterioration and loss of function such as a decrease in cycling loss over time between the terminal section 10 and the optical waveguide component 20. And can be done. In the manufacture of the above-mentioned nozzle 11, the opening 12a of the connecting member 12 made of a pyrex glass has a vertical length a of 0.2 to 5 mm in a range of 0.2 to 0 mm. set the type of value, eight full § i carbonochloridate hole ll g the full et rules 11 that have a 90, 150, 200 and 250 kg-f / 4 copies Ri pressure that different respective cm ² Under the above conditions, 30 pieces were each formed by the optically transparent epoxy resin mixed with silicon dioxide particles having a small heat shrinkage rate.

Here, the width b (mm) of the opening 12a is set to P-0.25ππππι for the array pitch of the fiber holes 11g, so that the fiber holes 11g Since the number (= the number of cores of the tape fin 13) is N = 8, 1.95 to 2.75 mm from the above equation of b = Px (N-1) + a Set to.

At this time, in the molded ferrule 11, the relationship between the vertical length a of the opening 12a of the gun contact member 12 and the cracking rate (%) of the gun contact member 12 is 100%, and the heat cycle is 100%. was examined had moldings Nitsu of that you only Le test HC characteristic variation width (d B) and molded pin preparative La pass rate related to Bull relation between the (%) in each 150 kg'f / cm ² At this time, the results shown in FIGS. 10 to 12 were obtained.

Here, the pass rate (%) was determined to be acceptable if there were no troubles such as bending or bending of the molding pin, and that the 30 pinholes were formed. It was calculated as a percentage of In addition, in the HC characteristic fluctuation width (dB) shown in FIG. 11, a total of 10 molded plastic rules 11 corresponding to the vertical length a were hit. The average fluctuation of HC characteristics was shown.

In addition, each of the 10 filters 11 randomly extracted from the group of 20 pieces of the molded pipes 11 having different vertical lengths a was inserted into the optical waveguide. An ultraviolet-curing adhesive was applied between the component 20 and was bonded by irradiating ultraviolet rays. The irradiation time (min.) Required for the bonding at this time was measured in relation to the vertical length a of the opening 12a, and the results shown in Fig. 13 were obtained.

Therefore, from the results shown in FIGS. 10 to 13, when the phenol rail 11 is formed, when the vertical length a of the opening 12 a exceeds 1.0 mm, It can be seen that the cracking rate exceeds 50% and the irradiation time of the photocurable resin used for bonding to the optical waveguide component 20 becomes less than one hour, which is not preferable.

Also, when the vertical length a of the opening 12a is smaller than 0.2 mm, when the ferrule 11 is manufactured, in the forming die shown in FIG. The filling space of the resin in the portion where the hole llg is formed becomes narrower. Therefore, as is clear from the pass rate (96) shown in Fig. 12, there are many troubles such as bending and bending of the molding pin during molding.

Therefore, the vertical length a of the opening 12a is preferably set in the range of 0.2 to 1.0 mm.

Here, the connecting member 12 has an opening 12a in which the width b is the same as the width of the phenol rail 11, that is, the connecting member 12 has a structure in which the connecting member 12 is vertically divided into two parts. That is not to say. However, Hue When the vertical length of the protruding portion 11c of the rule 11 corresponds to the vertical length a of the opening 12a, the yield of the rule 11 can be improved in the same manner as described above. It was possible to manufacture well.

In the terminal section 10 of the above embodiment, the connection member 12 was a square frame made of a magnetic glass provided on the end face 11 e of the ferrule 11. However, if the connecting member is provided on the butt end face side and the ultraviolet ray passes through the connecting portion between the terminal portion and the optical waveguide component, the arrangement is not limited to the above-described embodiment. Nor.

Accordingly, the connecting member may be arranged so that the outer periphery of the ferrule 11 is surrounded by the connecting member 12 together with the butt end face 11 e as shown in FIG. 14, for example. As shown in FIG. 15, prismatic connecting members 12 and 12 may be arranged on the upper and lower portions of the X rule 11 corresponding to the bonding portion with the optical waveguide component. No.

Further, as shown in FIG. 16, the connecting members may surround the butt end face lie of the ferrule 11 from above and below, and may be two U-shaped connecting members 14 and 15 each having a prismatic shape. Alternatively, as shown in FIG. 17, a prismatic contact member 16 arranged in the width direction above the butted end face 11 e of the ferrule 11 may be used.

Also, as shown in a connecting member 17 shown in FIG. 18, two openings 17 surrounding two abutting end faces 11 e of the ferrule 11 having two projecting portions 11 c formed therein. a Alternatively, as in a connecting member 18 shown in FIG. 19, the connecting member 18 may have a shape having an opening 18a surrounding the butted end face lie of the fin 11. Here, in the rule 11 in which the connecting member 18 is provided, the ends of the plurality of optical fibers 13a are exposed and arranged in two steps in the upper and lower stages on the butted end face lie. Second embodiment

Next, a second embodiment of the present invention will be described in detail with reference to FIGS.

The terminal section 60 of this embodiment has a connecting member 62 attached to a front part of a ferrule 61 and a tape fiber 63 attached to a phenol rail 61 as shown in FIG. 20. Then, as shown in FIG. 21, it is butt-welded to the optical waveguide component 70.

Since the phenol rail 61 is configured substantially in the same manner as the phenol rail 11 described in the first embodiment, a detailed description is given by assigning the reference numerals corresponding to the corresponding parts. Is omitted.

Off error Norre Lumpur 61, the linear expansion coefficient of F p is 1 2 X 1 0 - ⁶ synthetic resin, For example, the molding die 30 described in the first embodiment in Tsu by the Epoxy resin, Manufactured using 40 and core 50. In the present embodiment, since the terminal section 60 and the optical waveguide component 70 are brought into contact with each other by welding, the rule 61 does not need to be optically transparent.

The connecting member 62 has an opening 62a surrounding the periphery of the butt end face 61e of the rule 61, and can be welded with a small linear expansion coefficient. Metal, for example, with a linear expansion coefficient of aMc power of 2 to 4 X 10 — ⁶ (a registered trademark of Westinghouse Electric Corp. in the United States) is used to form a rectangular frame. It is molded. Here, as in the first embodiment, the opening 62a has a vertical length a (mm) in the range of 0.2 ≤ a1.0, and a horizontal length b (ram), If the number of optical fibers 63a constituting the bar 63 is N, and the array pitch of the optical fibers 63a is P (mm), b = P x (N -1) + a is set.

Ni will Yo of this, the terminal unit 60, the coefficient of linear expansion of a _MC of the connecting member 62 so set rather small Ri by the linear expansion coefficient a _FP of full We Noreru 61, when accompanied jar high temperature in the molding of full-et-rule 61 The connection member 62 suppresses the expansion in the width direction and the vertical direction of the protruding portion 61c, and suppresses the contraction at the time of cooling at the end of molding.

Accordingly, in the rule 61, since the expansion and contraction of the protruding portion 61c is suppressed by the connecting member 62, the fiber hole 61g opened in the butted end face 61e has high accuracy. It is formed by

Further, the plurality of optical fibers 63a of the tape fiber 63 are protected by being buried in an adhesive in the cavity 61b of the rule 61, and the tape fiber 63a is protected. Even if stress is applied via the wire, it will not break.

The optical waveguide component 70 surrounds a waveguide layer 72 formed on a 1 mm-thick silicon substrate 71 with a cylindrical square sleeve 73 around the outer periphery together with the silicon substrate 71. Therefore, the both end faces are the butt end face. The waveguide layer 72 is formed in parallel with the four waveguides 72a in the longitudinal direction at the same pitch as the plurality of optical fibers 63a. For example, a flame deposition method using quartz or the like is used. Thus, it is formed to have a thickness of several 10 m.

The square sleeve 73 has the same or similar linear expansion coefficient as the tang member 62 and is weldable to the connecting member 62, for example, M having a linear expansion coefficient. Is a sleeve consisting of 2 to 4 X 10 _ ^{6 components} .

Here, the square sleeve 73 is formed by approximating the area and shape of the optical waveguide component 70 at the butt end face to the connecting member 62 of the terminal part 60, and The effective welding area between the two is ensured.

The terminal section 60 of the present embodiment configured as described above is aligned with the optical waveguide component 70 and aligned between each optical fiber 63a and the corresponding waveguide 72a. I do.

Thereafter, as shown in FIG. 21, the connecting member 62 and the square sleeve 73 are welded at an appropriate welding point P by YAG laser beam welding, and the terminal portion 60 is light-guided. Connect to waveguide component 70.

Accordingly, in the above connection structure between the terminal portion 60 and the optical waveguide component 70, the connection member 62 has a linear expansion coefficient _aMC of 2 to 4 × 10 ⁶ and a linear expansion of the square sleeve 73. Rate α Μ. Equivalently, the linear expansion coefficient of the main part of the optical waveguide component 70 consisting of the silicon substrate 71 and the waveguide layer 72. Satisfies the relationship of about 2.4 1 0 — ⁶ , I a MC-ao I and 5 x 10 — ⁶ . For this reason, in the above connection structure, there is little or no difference in the linear expansion coefficient between the terminal portion 60 and the optical waveguide component 70 due to temperature change over time. Therefore, a dimensional change due to a change in the degree of module is suppressed to a small extent, and the alignment state between each optical fiber 63a and the waveguide 72a is not disturbed. Therefore, by adopting the above connection structure, it is possible to prevent deterioration in performance and loss of function, such as a decrease in connection loss between the terminal section 60 and the optical waveguide component 70 over time. Can be done. Third embodiment

Further, a third embodiment of the present invention will be described in detail with reference to FIG.

As shown in FIG. 22, the terminal portion 65 of this embodiment has a connecting member 67 arranged from the front to the lower portion of the ferrule 66 and a taper on the phenolic hole 66. The fitting 68 is attached to this, and it is butt-welded to the optical waveguide component 75.

The finaler 66 is configured in substantially the same manner as the rule 11 described in the first embodiment, and a detailed description thereof will be omitted.

Full et Norre one Le 66, linear expansion coefficient a _FP 1 2 synthetic resin X 1 0 ^-6, For example, the molding die described in the first embodiment in Tsu by the e port key sheet resin 30 , 40 and core 50. In this embodiment, since the terminal section 65 and the optical semiconductor 75 are connected by welding, the rule 66 is optically transparent. It does not need to be.

The connection member 67 has an opening 67a surrounding the periphery of the butted end surface 66e of the ferrule 66, and is a weldable metal having a small linear expansion coefficient, for example, a linear expansion coefficient a Mc of 2 to 5. 4 X 1 0 - Tsu by the ⁶ co bar Le and that is formed in the side view L-shaped. Here, the opening 67a has a vertical length a (mm) within the range of 0.2a ≤ 1.0 and a horizontal length b (mm) of the fin 66. The number of the holes 66 g, therefore, the number of optical fibers 68 a constituting the tape fin 68 was N, and the array pitch of the optical fibers 68 a was P (mm). At this time, the relationship is set to b = P x (N — l) + a.

Ni will Yo of this, the terminal unit 65, the coefficient of linear expansion of _F P by Ri small rather than set of full We rule 66 of the linear expansion coefficient of _MC of Sennyo member 67 - the constant was, in the molding of the full We Rule 66 When the temperature is high, the connecting member 67 suppresses expansion in the width direction and the vertical direction of the protruding portion 66c, and suppresses shrinkage during cooling at the end of molding.

Therefore, in the rule 66, since the expansion and contraction of the protruding portion 66c is suppressed by the connecting member 67, the fiber hole opened in the butt end face 66e can be formed with high accuracy. As a result, the plurality of optical fibers 68a are arranged with high precision.

Further, the plurality of optical fibers 68a of the tape fiber 68 are protected by being buried in an adhesive in the cavity 66b of the ferrule 66, and the tape fiber is protected. Even if stress is applied via 68, the wire will not break. On the other hand, in the optical semiconductor 75, a heat sink 78 is arranged between an LD array 76 in which a plurality of laser diode elements are arranged in one row and a carrier 77. Therefore, each laser diode element is electrically connected to the carrier 77 by a bonding wire 79, and the carrier 77 is a metal mount. Fixed to base 80. In here, Ma c down preparative base 80, to use a 2 ~ 4 X 1 0 one ⁶ also the closer to the linear expansion coefficient a _MC of linear expansion alpha _{Micromax beta} connection member 67.

The terminal section 65 of the present embodiment configured as described above is mounted on a base 69 arranged in abutment with the mount base 80 so as to face the optical semiconductor 75. You. At the time, the base 69 has a linear expansion coefficient α _Β that is close to the linear expansion coefficient _MC of the connecting member 67.

Use the ones.

Next, the inclination in the X-, Y-, and Z-axis directions and the optical axis direction between each optical fiber 68a and each corresponding laser diode element of the optical semiconductor 75 is described. Align.

Thereafter, the terminal portion 65 and the base 69 and the base 69 and the mount base 80 are welded at appropriate welding points P by YAG laser beam welding, and the terminal portion 65 is illuminated. Connect to semiconductor 75.

Ni will Yo of this, based having the above Oite the connection structure, the connection member 67 (coefficient of linear expansion of a _MC) mountain window down bets based 80 coefficient of linear expansion close to the (linear expansion coefficient _α Μ _Β) Β Since the terminal section 65 and the optical semiconductor 75 are connected using a screw 69, the difference in linear expansion coefficient

Β-a MCI or I α _Β — α _{Μ Β} | Powerful 5 x lO— smaller than ⁶ . For this reason, in the above connection structure, the difference in linear expansion coefficient between the terminal portion 65 and the optical semiconductor 75 due to the temperature change over time is small, and the temperature change causes the difference. The dimensional change is suppressed to a small extent. As a result, the alignment state between each optical fiber 68a and the corresponding laser diode element of the optical semiconductor 75 is not disturbed. Therefore, by adopting the above-mentioned connection structure, a decrease in performance and a loss of function such as a decrease in connection loss between the terminal section 65 and the optical semiconductor 75 over time are suppressed. Industrial applicability

As is clear from the above description, according to the present invention, the optical fiber terminal section has excellent connectivity with the optical device, is easy to manufacture, and is hard to be disconnected. The manufacturing method and the connection structure between the terminal unit and the optical device are provided.

At this time, if the linear expansion coefficient a _CM of the connecting member is set to be smaller than the linear expansion coefficient a _FP of the synthetic resin constituting the X rule, the optical fiber terminal section becomes時に The connection member suppresses the thermal expansion and contraction of the synthetic resin when molding the rule. Therefore, the fiber can form the fiber hole with high accuracy.

In addition, the connection member is an optically transparent material that is at least partially exposed on the outer periphery of the abutting end face of the ferrule, such as a glass. The light-curing adhesive is used at the end of the cable, making it possible to quickly connect to the optical device. You can connect.

Further, when the X-rule is a molded body made of any of thermosetting, thermoplastic or photo-curable synthetic resin, the optical fiber's terminal portion is The phenol can be molded inexpensively using a mold.

In addition, if the synthetic resin containing silicon dioxide constituting the ferrule contains a coupling agent, the optical fiber terminal section becomes the ferrule and the glass. Adhesion between the steel connecting member and the metal member is improved.

Further, when the synthetic resin constituting the fiber X rule is made of an optically transparent material having a refractive index close to the refractive index of the silicon dioxide, the optical fiber terminal portion is When connecting to an optical device, the irradiation light is more likely to penetrate, and the photo-curable adhesive used cures more quickly, reducing the time required for connection work with the optical device. Can be shortened. In particular, if the synthetic resin that constitutes the X rule is made of a material that does not contain a coloring component or carbon, the absorption of the irradiation light by the ferrule is reduced, so that the optical filter is used. Heat generation at the end of the fiber can be reduced, and the dimensional change of the ferrule due to temperature rise can be suppressed.

In addition, the surrounding member has a linear expansion coefficient a _CM that is a linear expansion coefficient of a constituent material of the optical device. And concerning _{_{D, I a CM - a 0}} D | Ku 5 X 1 0 ⁶ glass satisfies the relationship, have Ru Ah is combined thrust and the metal member provided on the corresponding to that position of the light Device office soluble The linear expansion coefficient of the connection member << _MC is the metal member The coefficient of linear expansion of α _Μ. It should be a metal that satisfies the relationship of I a _M c — α _{Μ 0} | <5 X 10 — ⁶ .

As a result, the difference in the linear expansion coefficient between the optical fiber terminal and the optical device due to the temperature change over time is small. The change is suppressed to a small extent, and it is possible to suppress a decrease in performance and a loss of function, such as a decrease in cycling loss over time.

Further, the connection member has an opening surrounding the periphery of the butt end face of the X-rule, and the opening is bonded to the optical fin by an optical fin. When the number is Ν and the arrangement pitch of the optical fibers is Ρ, the length a in the direction orthogonal to the arrangement direction of the optical fibers is 0.2 to 1.O mm The length b in the array direction is set so as to satisfy the relationship of b = Px (N-1) + a. As a result, in the optical fiber terminal portion, the area ratio of the connecting member occupying the entire butt end face can be set to an appropriate value, and the yield when molding the phenol can be obtained. It is better.

Further, in the connection structure between the optical fiber terminal section and the optical device according to the present invention, the optical device includes a plurality of optical fibers and a plurality of arrangement pitches equal to each other. An optical waveguide component having the above-described waveguide formed thereon, and is bonded to an optical fiber terminal portion by an ultraviolet curing adhesive at a portion of a surrounding member provided on the ferrule. With the connection structure, the optical fiber terminal and the optical waveguide component can be connected in a short time in seconds.

Further, the optical device is connected to the plurality of optical fibers. An optical waveguide component having a plurality of waveguides having the same row pitch and including a metal tube surrounding the outer periphery, and a connection member made of metal at the end face of the metal tube. And the connection structure is welded. Alternatively, the optical device is an optical semiconductor in which a plurality of laser diode elements are arranged, and the optical device is provided on a first metal base and an optical fiber terminal is provided on a second metal base. On each of the metal bases, and are installed so as to be aligned with each of the optical fins and the corresponding laser diode element. The gun base has a metal base that is welded to each other.

This makes it possible to form a connection structure in which the optical waveguide component or the optical semiconductor and the optical fiber terminal are connected by welding.

Claims

The scope of the claims

1. An abutting end face facing or abutting the optical device, and a single fiber hole or a plurality of fibers formed in parallel with a predetermined pitch An optical fiber, wherein one end of the optical fiber is inserted through each of the fiber holes, and the optical fiber is bonded and fixed, and the optical fiber is an optical device. In the optical fiber terminal that is optically connected to the

The ferrule is made of a synthetic resin molded body, and at least one connecting member is provided on an end face side of the ferrule to the optical device. off A Lee bus terminal section _t

2. The connection member according to claim 1, wherein the connection member has a linear expansion coefficient a _CM set to be smaller than a linear expansion coefficient a _FP of a synthetic resin constituting the _ferrule . Optical fiber terminal.

3. The optical fiber according to claim 2, wherein the connection member is made of an optically transparent material that is at least partially exposed at an outer periphery of a butt end of the rule. Iva terminal section.

4. The connection member according to claim 3, wherein the connection member is a glass having a linear expansion coefficient a _CM that satisfies the following relationship with respect to a linear expansion coefficient a _0D of a constituent material of the optical device. Optical fiber terminal.

I ac M-α 0 DI <5 x l0- ⁶

5. The connection member has an opening surrounding the periphery of the butt end face of the ferrule, and the opening is in contact with the ferrule. Assuming that the number of fixed optical fibers is N and the arrangement pitch of the optical fibers is P, the direction perpendicular to the arrangement direction of the optical fibers is assumed. The optical fiber according to claim 4, wherein the length 3 is 0.2 to 1,001 1111, and the length b in the array direction satisfies the relationship of b = P x (N-1) + a. Terminal section.

6. The claim according to any one of claims 1 to 5, wherein the ferrule is a molded body made of a thermosetting, thermoplastic, or light-curing synthetic resin. The optical fiber terminal section described in (1).

7. The optical fiber terminal according to claim 6, wherein the synthetic resin constituting the ferrule includes a capping agent and silicon dioxide as a filler.

8. The optical fiber according to claim 7, wherein a refractive index of the synthetic resin constituting the ferrule is close to a refractive index of the silicon dioxide, and is optically transparent. Iva terminal section.

9. The optical fiber 'terminal section according to claim 2, wherein said connection member is metal.

10. The connecting member is _butt- welded with a metal member provided at a corresponding position of the optical device, and a linear expansion coefficient a _{MC of the} connecting member is reduced to a linear expansion coefficient _αΜ0 of the metal member. The optical fin terminal section according to claim 9, which satisfies the following relation.

I α M c-a M O I <5 x 10

11. The connection member is provided around the butt end face of the ruler. The opening has an opening that surrounds the enclosure, and the opening has a number N of optical fibers that are fixedly attached to the phenol, and an arrangement pitch of the optical fibers. When P, the length a in the direction orthogonal to the array direction of the optical fiber is 0.2 to 1: 0 mm, and the length b in the array direction is b = Px (N−1 The optical fiber terminal according to claim 10, which satisfies the relationship of +) + a.

1 2. The claim is a molded article made of a thermosetting, thermoplastic or photo-curable synthetic resin. The optical fiber terminal according to any one of the above items.

1 3.—having a pair of template plates and a plurality of molding pins that are arranged between the pair of template plates and form fiber holes through which a plurality of optical fibers pass. A connecting member is arranged on at least one end side of the child, and synthetic resin is injected into a cavity formed between the set of template, the middle potato, and the connecting member, and the resin is injected into the cavity. A rule is formed, and the optical fiber is inserted into each of the fiber holes of the nozzle and bonded to each other, thereby forming one end of each of the optical fibers. A method of manufacturing an optical fiber terminal, characterized in that the optical fiber terminal is fixed.

14. The optical fiber terminal according to claim 1, wherein the optical fiber terminal is connected to the optical device so as to face or face-to-face. Connection structure between terminal unit and optical device.

1 5. The optical device is an optical waveguide component in which a plurality of waveguides having the same arrangement pitch as the plurality of optical fibers are formed, 9. The optical fiber terminal according to any one of claims 3 to 8, wherein a portion of the connecting member provided on the ferrule is bonded to an optical fiber terminal according to any one of claims 3 to 8 by an ultraviolet-curing adhesive. Connection structure between optical fiber terminals and optical devices.

1 6. The optical device is an optical waveguide component having a plurality of waveguides having the same arrangement pitch as the plurality of optical fibers and including a metal cylinder surrounding the outer periphery. The optical fiber terminal and the optical device, which are welded to the optical fiber terminal according to any one of claims 9 to 12 on the end surface of the metal tube. Connection structure.

1 7. The optical device is an optical semiconductor in which a plurality of laser diode elements are arranged, and the optical fiber terminal portion is provided on the first metal base and the second metal base. The optical fibers are opposed to each other, and are installed so as to be aligned between the respective optical fibers and the corresponding laser diode elements, so that the first and second metal bases are mutually opposed. The connection structure between the optical fiber terminal and the optical device, which are welded to each other.